Materials Literature
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When an aqueous AgClO4–sodium dodecylsulphate (SDS)–isopropyl alcohol (Pri OH) solution was photolysed with 253.7 nm light, a sharp and intense absorption band of colloidal silver (λ= 390–400 nm) appeared after a relatively long induction period. In contrast, the sharp colloidal absorption rapidly developed when an Ag…
Abstract New soluble polyimides with inherent viscosities of 0.2–0.6 dL/g were synthesized from 3,4‐bis (4‐aminophenyl)‐2,5‐diphenylfuran and various aromatic tetracarboxylic dianhydrides by the conventional two‐step method which involved ring‐opening polyaddition and subsequent cyclodehydration. Almost all of the pol…
This review critically evaluates the suitability of Auger spectral line shape analysis as a source of electronic structure information. Methods for extracting the true Auger line shape from the raw data and a theoretical framework for semiquantitative interpretation of that line shape are presented. A wide range of re…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTLight-scattering study of kinetics of spinodal decomposition in a polymer solutionJyotsana Lal and Rama BansilCite this: Macromolecules 1991, 24, 1, 290–297Publication Date (Print):January 1, 1991Publication History Published online1 May 2002Published inissue 1 January 1991h…
Iron porphyrins containing perhalogenated pyrroles are found to be much better catalysts for the hydroxylation of poorly reactive alkanes like pentane or heptane by PhIO (yields as high as 80%) than the corresponding iron porphyrins without halogens on the pyrrole rings; the chemoselectivity and regioselectivity of th…
Expansion of the orientational distribution function f(θ, t) of molecular dipoles in terms of Legendre polynomials with spherical modified Bessel functions in(μE/kT) as coefficients yields an analytic relation between the steady-state birefringence Δnz(ω) and the electro-optic coefficient χxxz(2)(-ω;ω,0) for a poled n…
We report polarized two-photon excitation spectra of the $^{3}$${\mathit{A}}_{2}$${\ensuremath{\rightarrow}}^{3}$${\mathit{T}}_{2}$, $^{1}$E, and $^{3}\mathrm{T}_{1}$ transitions of ${\mathrm{Ni}}^{2+}$-doped MgO measured by detecting the $^{3}$${\mathit{T}}_{2}$${\ensuremath{\rightarrow}}^{3}$${\mathit{A}}_{2}$ infra…
High-level waste (HL W) is a natural component of the nuclear fuel cycle. Because of its radioactivity, HL W needs to be handled with great care. Different alternatives for permanently storing HL W are evaluated. Studies have shown that the disposal of HL W is safest when the waste is first vitrified before storage. S…
At temperatures below 60 K A2ReCl6(A = K, Rb, Cs) crystals emit intense, well resolved luminescence in the 13 900–12 800 cm–1 region under blue–green excitation. The emission is strongly temperature dependent and also depends somewhat on the excitation wavelength and crystal quality. It is here assigned as the vibroni…
ダイヤモンドライクカーボン(DLC)は,著しい低摩擦特性と高硬度とをあわせもつ長寿命の固体潤滑皮膜として有望である。低い温度で密着性よく皮膜形成する手段として,有機化合物の蒸着とイオン照射を併用したイオンビームアシスト蒸着法を紹介する。典型的なDLCである水素を含む非晶質炭素(a-C:H)は,真空中や乾燥雰囲気下では～0.02という著しく低い摩擦係数,μを示す。しかし水分を含む雰囲気下ではμは,0.2程度まで増大する。この水分による摩擦特性の劣化は,Siとの合金化によって著しく改善できる。すなわちa-C1-xSix:H(0.05≦x≦0.35)は,高湿度雰囲気下でもμ～0.05であり,真空中や乾燥雰囲気下ではμ≦0.02である。こ…
Two kinds of resins for molded transformers have been developed and their electric and mechanical characteristics were evaluated at various temperatures. Each resin has good characteristics below the glass transition temperature. During the past 12 years, 20000 molded transformers using these resins have been produced…
Abstract In single crystals of scapolite from two different localities, three paramagnetic centres are detected by electron paramagnetic resonance (EPR): 1. One isotropic singlet with g iso = 2.005; 2. One triclinic singlet with g ‖ = 2.005 ± 0.001 and g ⟂= 2.009; 3. One triclinic sextet with g ‖= 2.005 ± 0.001, g ⟂ =…
Grain boundary deformation measured using the electron lithographic microgrid technique has been found to give rise to regions of compressive longitudinal strain as well as strain concentrations in a uniaxial tensile creep test. The complexity of the experimental strain distribution is better explained by the use of a…
The interaction of cobalt(II) porphyrins and chlorin with 4,6-dinitrobenzofurazan 1-oxide (dnbfo) has been studied by spectroscopic methods. Initially all the cobalt(II) porphyrins form molecular complexes with the electron acceptor dnbfo, but with time a complete electron transfer is observed. This results in the for…
Single crystals of Cs 3 Sr[Cu 2 (SCN) 7 ] of optical quality and dimensions up to 10 × 10 × 30 mm 3 have been grown from non-stoichiometric aqueous solutions. The crystal structure has been determined from singlecrystal diffractometer data by Patterson methods and refined to a final R = 0.029 for 1116 unique reflectio…
The dispersion behaviour of two commercial SiC whisker samples and one SiC powder has been investigated in aqueous and non-aqueous media using equilibrium sediment density measurements. In water, the pH range 9–11.0 was identified as being optimum for the dispersion of the SiC materials. The colloidal stability of aqu…
Abstract The behavior of particles at the phase transition between a gas or liquid and another liquid phase may be characterized by the so‐called wetting (or contact) angle. In contrast to plane surfaces, which allow such measurements to be conducted relatively easily, the determination of the wetting angle between a…
To prevent duplication of effort and to facilitate the building of compatible databases on material property data, ASTM Committee E49 on Computerization of Material Property Data has active efforts underway to develop standards and guidelines in the areas of: (1) designation systems for engineering materials, (2) reco…
With the flux-technique single crystals of (Al, Ge)-mullites have been synthesized in the range of 1.28 A1 2 0 3 · 1 GeO 2 to 1.93 Al 2 O 3 · 1 GeO 2 . Chemical and optical (microrefractometer spindel-stage) data of the solid solution series have been collected. The results of a structure refinement of the mullite 1.9…
The local structured around cobalt and yttrium ions in a 1,2,3-type ceramic oxide containing cobalt instead of copper, YBa1.5K0.5Co3O8, has been characterized by means of extended X-ray absorption fine structure spectroscopy. The crystal structure has been refined by rietveld analysis of X-ray powder diffraction data.…